Definitions for "O.C"
On center; (See CENTERS)
On Center. A measurement term meaning a certain distance between like materials. Studs rafters, joists, and the like in a building placed at 16 inches O.C. will be laid out so that there is 16 inches from the center of one stud to the center of the next.
An abbreviation for "on center."
On centre; (See centres)
Order-in-Council